Automatic continuous-cutting rotary log feeder for band-sawing mills



N 1966 SUEKICHI YUMINO 3, 86,7 3

AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLSFiled Dec. 4, 1963 16 Sheets-Sheet 1 177/97 S148 6/2/71 um 7 Nov. 1966SUEKICHI YUM|NO 3, ,7 3

AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLSFiled Dec. 4, 1963 16 Sheets-Sheet 2 ATTORNEYS Nov. 22, 1966 SUEKICHIYUMINO 3,286,743

AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLS l6Sheets-Sheet 3 Filed Dec. 4, 1963 I l I v- 1966 SUEKICHI YUMINO3,286,743

AUTOMATIC commuous-cumme ROTARY LOG FEEDER FOR BAND-SAWING MILLS FiledDec. 4, 1963 16 Sheets-Sheet 4 ATTORNEYS v Nov, 22, 1966 SUEKICHI YUMINO3,286,743.

AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLS l6Sheets-$heet 5 Filed Dec. 4, 1963 J m e277?)- Su 124 114) M 777 7: PM977W ATTORNEYS NOV. 1956 SUEKICHI YUMINO 3,286,743 AUTOMATICCONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLS Filed Dec.4'. 1963 16 Sheets-Sheet s 31 e 191 0. 1' ya 271/770 a; WW flaw mm MATTORNEYS N 1966 SUEKICHI YUMINO 3,286,743

AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLSFiled Dec. 4, 1963 16 Sheets-Sheet 7 ATTORNEYS N v- 22, 1966 SUEKICHIYUMINO 3,

I AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLSl6 Sheets-Sheet 8 Filed D60. 4, 1963 5 u e kI C/Z/ /W/Wo ATTORNEYS Nov.22, 1966 sun-:mcm YUMINO 3,286,743

AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLSFiled Dec. 4, 1963 16 Sheets-Sheet 9 A ATTORNEYS 2, 1966 SUEKICHI YUMINO3,286,743

AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BANDSAWING MILLS l6Sheets-Sheet 10 Filed Dec. 4, 1963 w m mm w MW J w a b L a 5 Nov. 22,1966 Filed Dec. 4, 1963 SUEKICHI YUMINO AUTOMATIC CONTINUOUS-CUTTINGROTARY LOG FEEDER FOR BAND-SAWING MILLS Fig. /2

16 Sheets-Sheet 11 JUL I 0 IO E ATTORNEY 1966 SUEKICHI YUMINO 3, 6, 3

AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLSFiled Dec. 4, 1963 l6 Sheets-Sheet 12 Sue f/a/z/ J u 777/71 0 25w: himWW ATTORNEYS Nov. 22, 1966 SUEKICHI YUMINO AUTOMATIC CONTINUOUS-CUTTINGROTARY LOG FEEDER FOR BAND-SAWING MILLS Filed Dec. 4, 1963 16Sheets-Sheet 13 ATTORNEYS Nov. 22, 1966 SUEKICHI YUMINO AUTOMATICCONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLS l6Sheets-Sheet 14 Fig. 20

l'm'enjbr w/n Mm KW Z/QZ Y%/MZ24/ ATTORNEY$ Nov. 22, 1966 SUEKICHIYUMINO 3, ,7 3

AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLSFiled Dec. 4, 1963 16 Sheets-Sheet 15 I 294 Fig. /8

W 29/ J HHHHHH l llllllll l MW ATTORNEYS Nov. 22, 1966 SUEKICHI YUMINO3,286,743

AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLS l6Sheets-Sheet 16 Filed Dec. 4, 1963 ATTORNEYS United States PatentOt'tiee 3,286,743 AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDERFORBAND-SAWING MILLS Suekichi Yumino, 2 Nishi-6-ch0me, Kita-S-jo,

Sapporo-ski, Japan FiledDec. 4,1963, Ser. No. 327,969 Claims priority,application Japan, Dec. 8, 1962, d

Claims. (Cl. 143-105) This inventionrelates to log feeders forband-sawing mills and to those of the rotary type which are adapted forautomatic continuous operation and includes a substantially circularchuck wheel rotatable ina vertical plane and adapted to carry a numberof logs on the periphery to feed them successively through a band-sawingmachine for production of boards.

In previous lumber mills, logs have generally been placed on ahorizontally reciprocable carriage, positioned to extend beyond thecarriage deck by a distance corresponding to the desired board thicknessand advanced through the band saw to sawoff a board of the desiredthickness. The carriage has subsequently been moved away from the bandsa-w by means of a backing device to avoid danger until it is retractedto its initial position when the log is again positioned by the settingdevice for the next sawing cycle. This sequence has been repeated asrequired. 'As will be apparent, the conventional lumbering process hasincluded various forms of loss in time, such as the time for back strokeof the reciprocable carriage, time for the carriage to be retracted bythe backing device to avoid engagement of the log with the band saw,time for advancing the carriage to its cutting position after it hasbeen restored to its initial position, time for ,operation of the setterduring which time the band sa-w must idle, and additional cutting timefor acceleration and deceleration of the carriage to and from thecutting speed required at each end of its reciprocatory movement.

Another difiicultyinvolved in conventional log feeders comes from thefact that the log carriage is mounted for reciprocation on a number ofwheels adapted to run over a pair of track rails, which are in pointcontact with the wheels. With such arrangments, a curved cut has oftenresulted from some wrongness of the rail arrangement, intervention ofsome sawdust between the rails and wheels, wheel racing, etc. t

,Heretofore, accurate log positioning on the carriage has been ratherdifiicult. As .is well known, the backing device on conventional logcarriages has included .a

screw-threaded element which is rotatable with rotation of the carriagewheels and the stop position of the element has provided the referencefor log positioning. Therefore, the positioning accuracy hasoften beenreduced by variation in magnitude of the rotating mass. of the threadedelement. In addition, it has-been diflicult to obtain a uniform settingsince both static and dynamic frictions inevitably take partsin thesetting operation, which necessitates stopping of the carriage at eachreciprocation thereof for operation of the setter, and, once a log iserroneously positioned to extend excessively beyond the carriage deck,correction of the log setting has been extremely difiicult even by useof a magnifying lens, compelling the sawyer to work on such more or lessinaccurate settings. p I y Accordingly, a primary object of the presentinvention is to provide a novel rotary log feeder which does not relyfor cutting feed upon the forward stroke motion of a horizontallyreciprocable carriage as employed previously but is adapted to rotatelogs on a stationary frame in a vertical planefor continuous cuttingoperation, thereby eleminating any idling of the band saw as requiredduring reciprocation of the wheeled carriage and increase in PatentedNov. 212, 1966 cut-ting time due to acceleration and deceleration ofsuch carriage required at each end of its reciprocatory movement, whileat the same time avoiding various difiiculties often resulting from thepoint contact between the carriage wheels and rails, as described above.

Another important object of the present invention is to provide a novelautomatic continuous log feeder which includes a setter or positioningdevice operable upon the basis of the advance of a threaded element toensure smooth and accurate log positioning and which eliminates the needof ceasing the cutting motion for log setting at the expense of cuttingtime. i

A further object of the present invention is to provide a novel type tof log feeder which dispenses with any backing device and hence is freefrom loss of time previously unavoidable to retract the wheel carriagefrom the band saw by the backing device and also from occurrence ofanycurved out due to variation in inertia of the rotating. mass of thethreaded element in the backing device, which has previously beenrestored to for reference in the setting operation.

According to the present invention a log feeder is provided whichincludes a carriage having a plurality of wheels mounted on a pair ofrails for travelling thereover and appropriate bearing brackets mountedon the carriage rotatably to support a main shaft, on which asubstantially circular chuck wheel is mounted fast for rotation in avertical plane. A number of logs are mounted on the chuck wheel andadvanced through a band saw. Also mounted on the carriage is a geartransmission mechanism including a main feed gear box and a differentialgear box for continuously advancing the chuck wheel with logs mount-,

ed to be cut thereon. i

Experiments have revealed that with the apparatus of the presentinvention practically no alternation of loaded and unloaded statesoccurs and the cutting force remains uniform to give an enhancedsawingefliciency. Also int-o boards of different thicknesses and in onepreferred embodiment, which will be described in detail herein-' after,six switching handles are provided to give asmany as forty thicknesssettings.

One important advantage of the present invention is that it renders itpossible to apply a band saw to sawing lumber 1 for pencil use withproduction efficiency surprisingly increased.

The present invention will now be described in further detail withreference to the accompanying drawings, which illustrate a preferredembodiment of the invention and in which like reference charactersindicate like parts in different figures.

In the drawings:

:FIG. 1 is a general plan bodying the invention;

FIG. 2 is a front elevational view of same with a part removed, the partof FIG. 2 lying to the right of line A-A' being taken on line A-A inFIG. 1;

FIG. 3 is a side elevational view of the apparatus;

FIGS. 4a and 4b are planviews, respectively, of the left and right halfportions of the body of the apparatus shown in FIGS. 1 to 3;

view of the apparatus em- FIGS. 5a and 5b being front views,respectively, of the left and right half portions of the body ofapparatus FIG. 6 is a side elevation of the feeder body partly shown insection taken along the line BB in FIG. b;

FIG. 7 is a front elevation of the main feed gear box;

FIG. 7a is a front view of the clutch operating mechanism in the powertransmission mechanism;

FIG. 8 is a plan view of the main feed and differential gear boxes,shown partly in section taken along the lines H-H in FIG. 7;

FIG. 8a is a cross section taken along the line KK' in FIG. 8;

FIG. 9 is a front elevational view of the differential gear box;

FIG. 10 is a side elevational view showing the main feed anddifferential gear boxes partly in section taken along the lines D-D' inFIG. 9;

FIG. 11 is a front elevation of the mechanism for the rotation of thedelivering chuck wheel;

FIG. 12 is a side elevation of same;

FIG. 13 is a side elevation of the brake means for the delivering chuckwheel;

FIG. 14 is a rear elevational view of same;

FIG. 15 is a plan view showing the stop device for the carriage partlyin section taken along the line E-E' in FIG. 16;

FIG. 16 is a front elevation of same taken along the line F-F in FIG.15;

FIG. 17 is a side elevation of the same;

FIG. 18 is a plan view of the winch device for travelling the logcarriage;

FIG. 19 is a diagrammatic front elevation of same;

FIG. 20 is a cross-sectional view taken along the line I-J' in FIG. 18;

FIG. 21 is a diagrammatic front elevation of the position indicator forthe log carriage;

FIG. 22 is a diagrammatic side elevation of same;

FIG. 23 is a plan view of the log engaging device to be mounted on theband-sawing machine; and

FIG. 24 is a front elevation showing same partly in section along theline G-G in FIG. 23.

Referring to the drawings and first to FIGS. 1 to 3, a log receivingchuck wheel 19 and a delivery chuck wheel 20 are mounted for rotation ona main shaft 18 'journaled in bearings 14, 15, 16 and 17 secured to thetop of a cast iron frame 3. Logs to be cut into boards are mountedsubstantially on the periphery of the receiving chuck wheel 19, which inthis embodiment is gen erally hexagonal including six generallytriangular segments. The logs are to be rotated by the delivery chuckwheel 20 which is adapted to be driven from a motor mounted on a mainfeed gear box 21 at a speed variable by the power transmission mechanismenclosed in said gear box. The logs are positioned by the chuck wheel 20to be cut by band saw 37, when chuck wheel 20 is operated through themain feed gearing in box 21 and the differential delivery gearing indifferential gear box 22. Being mounted on the periphery of therotatable chuck wheels, they are cut continuously by band saw 37. Withthis arrangement, there is no need of imparting reciprocatory motion tothe log carriage for each cutting stroke. The log positioning of feedingcan be effected satisfactorily without interrupting the machineoperation by advancing the chuck wheel 20 through axial sliding motionalong the main shaft 18 of differential gear box 21.

Referring next to FIGS. 5a and 5b, the log or lumber receiving chuckwheel 19 includes triangular segments each including a peripheral beamwhich has lumber receiving seats 28 formed at opposite ends to overhangat right angles to its body. A lumber presser foot 35 is provided tocooperate with the lumber receiving seat 28 and has a sole surfaceextending parallel thereto to hold a lumber placed on the seat. Thepresser feet 35 are actuatable by threaded rods 33 and 34 which are eachvertically movable by way of a worm wheel 32 meshing with a worm mountedon either end of a worm shaft 29, which is rotatable by a handle 31.

As seen in FIGS. 2, 4a, 5b and 6, the delivery chuck wheel 20 includes anumber of peripheral frame beams forming respective triangular segmentsof the wheel (six in number in this embodiment) and chuck brackets 36attached to the respective beams intermediate the ends thereof. A handle53' is secured to a threaded shaft 38 at one end thereof and is operableto move the latter radially of the chuck wheel 20. The threaded shaft 38is threadably engaged with a support member which rockably supports theouter hacker arm 39 by means of a pin 41 in a manner so that the hackerarm 39 can be moved radially inwardly and outwardly. Also, provided is arod 52 which is radially movable by operation of a handle 53 arrangedadjacent one end of the rod. The rod 52 is properly pivoted at the otherend to an inner hacker arm supporting arm 45 by means of a pin 51 forradial movement of an inner hacker arm 44, which is rockably supportedon said supporting arm 45 at its one end by means of a pin 48. Thesupporting arm 45 is properly pivoted to the chuck bracket by a pin 46.The hacker arms 39 and 44 carry at opposite ends hacker 40 and 47,respectively, so as to uniformly clamp and hold in place the lumber byoperation of handles 53' and 53 despite variations in its thickness.

Hacker arms 39 and 44 are provided with spring means 42, 43 and 49, 50,respectively, which are adjustable to maintain the hacker arms when notused in parallel with the adjacent beam of the delivery chuck wheel.

As shown in FIG. 5b, grooved eccentric rollers 54 and 55 of the sameconfiguration are mounted on respective pairs of bearings 5657 and 58-59which are secured to the beam of the chuck wheel 20. A handle 62 isprovided to rotate each grooved roller by way of a worm gear 60 or 61.The radially remote portions of the grooved eccentric rollers areoperable to bite into the lumber and there are provided a scale 63 and acooperating pointer 64 for each roller so that the forward edge of thelumber may be advanced prior to the cutting by a distance correspondingto the desired thickness of boards to be sawed off from the log.

Referring next to FIGS. 23 and 24, there is provided a band-sawingmachine which includes a cont-rolling bracket frame 68 carrying bearings69 and 70, in which a shaft 71 carrying a number of round rollers isjournaled. The bracket frame is mounted on a shaft 67 journaled inbearings 65 and 66 secured to the machine bed and is mounted on an eyebolt 73 by way of an opening formed in the frame at its one end. Thebolt 73 is suitably secured to the machine bed with a coil spring 74mounted on said bolt between the machine :bed and the bracket frame 68.A nut 75 is adjustable on the bolt 73 so as to place the round rollersin tangential contact with the cutting edge of the band saw so that therollers in contact with the lumber being cut serve to make the latterstable.

As seen in FIGS. 5a and 5b, the supporting chuck wheel 19 is connectedwith the delivery chuck wheel 20 by means of male guide pieces 27 on thesupporting chuck wheel 19 which are in sliding engagement withrespective female guide members 26 carried on the delivery chuck wheel,both chuck wheels being rotatable.

- A power transmission mechanism shown in FIGS. 7 and 8 is providedwhich includes a drive pinion 24 operable to rotate the delivery chuckwheel 20 by way of a gear 25. The shaft of a motor mounted on the mainfeed gear box 21 by suitable bracket means carries two V-wheels 88 and89 having the same diameter, which is operably connected by way ofV-belts 100 with respective V-wheels 86 and 87 loosely mounted on anintermediate shaft supported on two bearings 99, which are also securedto the main feed gear box.

' V-wheels 83 and 84 of the same diameter are mounted on the other endof the intermediate shaft 85. Another intermediate shaft 90 is mountedin the main feed gear box and extends outwardly beyond the latter withV- wheels 81 and 82 loosely mounted on the extended end of the shaft 90'and connected by V-belts 123 with respective V-wheels 83 and 84.Suitable bearings are mounted on the opposite walls of the main feedgear box to support the intermediate shaft 90. Also mounted on the wallsof the gear box are bearings 76 and 77 for supporting a pinion shaft 78which carries a pinion 78 meshing with a gear 80 mounted on theintermediate shaft 90'. As shown, thedrive pinion 24 is mounted on oneend of the pinionshaft which extends forwardly beyond the adjacent wallof the main feed gear box. Clutches 90 and 91 are provided toselectively couple the V-wheels 81, 82 and 86, 87 to respectiveintermediate shafts 90' and 85, on which said V-wheels are looselymounted. With this arrangement, it will be apparent that the speed ofrotation of the pinion 24 and gear 25 and hence of the chuck wheels20'and 19 can be varied in four steps. 1 The V-belts 100 can be adjustedin tension by adjusting screws 101, 102,103 and 104 provided on themotorbracket while the V-belts 123 are adjustable by adjustment ofintermediate shaft 85. The operation of the clutches 90 and 91 will bedescribed in further detail hereinafter. i

As shown in FIG. 8, a first main feed trans-mission shaft 106 aresupported by bearings 107 and 108 suitably mounted in the walls of themain feed gear box 21, and an appropriate bearing 109 formed on the rearwall of the differential gear box 22, and gears 110, 111, 112 and 113having teeth'differing in number in aprogression are mounted on thetransmission shaft 106 within the main feed gear box. The shaft106 alsocarries on its forward end a gear 105 in meshing engagement with thegear 25. The gears 110, 111, 112 and 113 are arranged to driverespective gears 114, 115, 1 16 and 117 by way of idler gears 118, 119,120 and 121, the first two of which are mounted on a lever block 165with the remaining two gears 120, 121 mounted on another lever block166. The gears 114, 115, 116 and 117 are mounted on a secondtransmission shaft [122 supported by appropriate bearingsmounted in thewalls of the main feed gear box 21. second transmission shaft and is inmesh with a gear 125 loosely mounted on the m ainshaft 18. Also in meshwith the loose gear 125 are gears 126, 127, 128 and 129 mounted onrespective threaded shafts 130, 131, 132 and 133, which are mounted onappropriate bearings carried by the walls of the main feed anddifferential gear boxes 21 and 22 so as to extend through the rear wallof the main feed gear box and the .front and rear walls of thedifferential gear box.

' A number of gears 134, 135,136, 137 and 138 having different numbersof teeth are mounted on the first main feed transmission shaft 106within the differential gear box 22 and are in mesh with respectivegears 145, 146, 147, 148 and 149 mounted on a third transmission shaft144 by way of idler gears 139, 140, 141, 142 and 143, the third shaft144 being journaled in appropriate bearings mounted in the walls of thedifferential gear box. Also mounted on the third transmission shaft 144isa pinion 150 which is engageable with a two-step gear 151 looselymounted on the first transmission shaft by way of a combination idlergear 152-153 or an idler gear 154 for rotation in a forward or reversedirection. The twostep idler gear 151 includes a pinion meshing with thelarger gear of a two-step idler gear wheel 155 loosely mounted on thethird transmission shaft 144, said pinion being also in mesh with a gear156 loosely mounted on the main shaft 18. The gear 156 is in mesh withgears 157, 158, 159 and 160 mounted on the respective threaded shafts130, 131, 132 and 133 (see FIGS. 9 and These gears 157, 158, 159 and 160each have a threaded axial bore and a forward boss portion having aninner and an outer diameter respectively to threadably fit in theassociated threaded shaft and over the female threads formed in theassociated bearing 161, 162, 163 or 164 A pinion 124 is mounted on the.

so as to slide along the shaft while rotating with the gear 156 inmeshing engagement therewith. Among idler gears 139, 140, 141, 142 and143 cooperating with gears 134, 135, 136, 137 and 138, idler gears 139and are mounted on a lever block 67, gears 141 and 142 on another leverblock 168 and gear 143 on a further lever block 169. These lever blocks167, 168 and 169 as well as the aforementioned lever blocks 165 and 166are all mounted on the first transmission shaft 106 and are operable torock about the axis thereof for selective engagement of the gearsthereby to afford different feeds of the delivery chuck Wheel.Specificially, the amount of feed given by the main feed gear selectedby operating lever blocks 165 and 166 may further to finely varied byoperation of lever blocks 167, 168 and 169 and the one for the two-stepidler gear 151. It will be recognized that with the illustratedembodiment different amounts of feed, forty in all can, can be obtainedby operation of the six lever blocks.

As shown in FIG. 6, the lever blocks 165, 166, 167, 168 and 169) havetheir outer ends jointed by pin means to the lower forked end ofrespective vertical r-ods 170, 171, 172, 173 and 174, which have upperforked ends thereof jointed by pin means to one end of handle leverblocks 175, 176, 177, 178 and 179, respectively, as shown in FIG. 4a. i

As shown in FIGS. 4a and 4b, brackets 180, 94, 182

and 92 are secured to the four top corners of the main feed gear box 21and similarly brackets 184, 185, 186 and 187 are secured to the four topcorners of the differential gear box 22. An elongated pipe 188 issupported at one end by bracket and extends through bracket 182 to apoint adjacent to the right-hand end of the frame 3, as viewed in FIG.4b. An elongated pipe 189 is supported by brackets 94 and 92 andelongated pipes 190 and 191 are supported by brackets 184, 186 andbrackets 185, 187, respectively. Brackets 181 and 183 are securedadjacent the right-hand ends of the elongated pipes 188 and 189,respectively, with a cross holder shaft 200 supported by brackets 181and 183 to extend at right angles to the elongated shafts. A bracket 192is supported by the elongated pipe 188 intermediate the brackets 182 and181 while a bracket 193 is supported by the elongated pipe 189intermediate the brackets 92 and 183. The brackets 192 and 193 support ashaft 196 at right angles to the elongated pipes. The shaft 196 definesa fulcrum point about which handle levers 175 and 176 are operated. Thecross shaft 200 is formed with constraining guides for these handlelevers. Similarly, elongated pipes 190 and 191 have secured theretobrackets 198, 194 and brackets 199, 195, respectively, with a crossholder shaft 201 arranged between brackets 198, 199 and a shaft 197between brackets 194, 195. The cross holder shaft 201 serves as a memberto support constraining guide pieces for respective handle levers 177,178 and 179 while shaft 197 acts as a fulcrum therefor. With thisarrangement, any of idler gears 110, 111, 112, 113, 134, 135, 136, 137and 138 can be selected for effective driving engagement by said handlelevers, as will be ,readily observed. The handle levers for idler gears152, 153 and 154 are also arranged to serve therefor in asimilarfashion.

The clutch 91 interposed between the motor on the main feed gear box andthe idler V-wheels on the intermediate transmission shafts is jointedwith crank 97 by pin means at the top and bottom ends of a vertical rod202, as shown in FIG. 7a. A crank shaft 203 integral with crank 97extends through the aforementioned elongated pipe 189 and is journaledin the opposite ends thereof. Thus, the clutch 91 may be engaged ordisengaged by lateral movement of a handle 96. Another clutch 90 isconnected with a crank 93 by way of a vertical rod 204 pivoted atopposite ends to the clutch 90 and crank 93. A crank shaft 205 integralwith crank 93 is journaled in bearings mounted on respective brackets206 and 207 secured to elongated pipe 189 (FIG. 4b) so that the clutch90 can be engaged and disengaged by lateral movement of handle 98.

FIGS. 11 and 12 illustrate in detail a stop motion mechanism for thedelivery chuck wheel 21). A rotation restraining bracket 2118 is securedto the delivery chuck wheel 20 and a threaded member support 213 issecured by a lock screw 214 to the bracket in a position thereon asillustrated. A pin 209 is secured to the bracket at a point thereon. Astop guide 210 is swingably mounted at one end on said pin 209 andpivoted adjacent to the other end to the forked end of a threaded member212 by pin means 211, which threaded member extends through said support213. The stop guide 211? can be held in a position adjusted by operatinga nut on said threaded member 212. As illustrated, brackets 215 and 212are secured to the side of the frame 3 and a lever 217 is pivotedintermediate its ends to the bracket 215 by means of a pin 216. Thelever 217 carries a pin 218 at its bent top end to support a roller 219and has a tapered bottom end in which a downwardly open notch is formedfor the purpose described below. A guide block 221 has a cylindricalhead portion formed with a conical top and is slidably fitted in avertical aperture in the bracket 220. The bottom portion of the verticalaperture is screw-threaded to threadably receive an adjustable springabutment 223 to confine a compression spring 222 between the top of thespring abutment and the underside of the head of guide block 221. Anaxial aperture is formed through the spring abutment 223 to receive theleg portion of the guide block 221, the conical top end of which isnormally biased by the compression spring 222 into the notch in thebottom end of lever 217. A rod 224 is pivoted at one end by means of apin 225 to a point adjacent the top end of the tapered bottom portion ofthe lever 217 and at the other end by means of a pin 228 to a switchlever 226. A lug is formed on the rod 224 intermediate its ends forengagement with a push-out cam 229. A hydraulic cylinder 2311 ispivotally mounted by means of a pin 231 on the inside surface of theframe 3 between brackets 232 and 233 secured thereto and is rockablebetween the solidand dotted-line positions shown in FIG. 11. A piston234 is arranged in the hydraulic cylinder for vertical sliding movementtherein. A stop member 235 is secured to the top of piston 234 and oilpressure can be introduced into the space in the cylinder extendingbeneath the piston 234. A vertical rod 237 is pivoted at its top end bya pin means 236 to that end of the rod 224 adjacent to the switch leverand is .swingably mounted intermediate the ends by means of a pin 238 onthe frame 3. A horizontal rod 240 is pivoted at one end by a pin 239 tothe bottom end of the vertical rod 237 and at the other end to the valverod 242 of an oil pressure regulator valve 243 by means of a pin 241.One side of the oil pressure regulator valve 243 is in communicationwith the hydraulic cylinder 239 by way of a hydraulic circuit line 244and a high-pressure rubber hose 248 and the other side of the valve witha pressure regulator cylinder 246 by way of a hydraulic circuit line245, which includes an oil pressure gauge 247.

With this arrangement, if the stop guide 213 is adjusted in position soas to come into contact with the roller 219 just before the lumber hasbeen completely cut, such contact will cause the lever 217 to rock aboutpin 216 and the lever 224 will be moved more than a distancecorresponding to the movement of the roller 219 under the effect of thecompression spring 222. Accordingly, the switch lever 226 is moved toopen a switch 227 for the motor mounted on the main feed gear box 21 todeenergize the motor. At the same time, the vertical rod 237 rockableabout the pivot pin 238 causes the horizontal rod 240 to operate thevalve rod 242 in a direction to open the oil pressure regulator valve243. On the other hand, the push-out cam 229 operates to forcibly swingthe hydraulic cylinder 230 about pin 231 from S the dotted-line positionto the solid-line position in FIG. 11, when the stop member 235 isbrought into abutment with the shoulder on the rotation restrainingbracket 298 and the delivery chuck wheel 20 ceases to rotate.

To release this rotation restraining eifect, switch 227 is first closedto start reverse rotation of the motor thereby to release the contactbetween the stop guide 210 and roller 219. Then, when handle 249 isoperated to restore the lever 217 to its initial position, the rods aremoved in a direction opposite to that in which they are moved forstopping the chuck wheels and the regulator valve 243 is opened while onthe other hand the push-out cam 229 is released to allow the hydrauliccylinder 230 to be restored to its normal position indicated by thedotted lines in FIG. 11 under the resilience of the highpressure rubberhose 248.

Shown in FIGS. 13 and 14 is a brake device for the delivery chuck wheel20 and hence for the supporting chuck wheel 19 and provided for stoppingthe chuck wheels in emergencies. The device takes the form of aconventional band brake which is operable by stepping on a pedal 297 andthe construction and operation of which will be apparent from FIGS. 13and 14 Without any further description.

As shown in FIGS. 1, 2 and 3, the lumber carriage 3 is mounted on fourwheels 2 riding two rails, one of the fiat type and the other of theangular type. The carriage 3 carries on the rightand left-hand sidesthereof respective wire-anchoring members 5 and 7, to which a wire 8 issecured at opposite ends which extends over a Wire wheel 6 and is woundabout a winch drum 4. A handle 289 is provided on the winch and operableto cause the carriage 3 to travel right and left by way of wire 8. Thetravelling movement of the carriage is automatically interrupted by foursets of stops 252 which are engaged upon arrival of the carriage at apredetermined position. The stop device will next be described infurther detail with reference to FIGS. 15, 16 and 17.

In FIGS. 15, 16 and 17, flanged members 252 are secured to both therightand left-hand sides of the frame 3 immediately above the respectiverails. As shown, a stop rod 250 is fitted in the axial bore formed ineach of the flanged members 252 and carries a collar 267 held on ashoulder portion of the rod with acoiled spring 268 arranged to surroundthe latter between the collar 267 and the flange portion of the member251. As shown in FIG. 1, secured to the rails 1 at opposite ends thereofare stop brackets, four in all, each of which includes chuck pieces 253and 254 pivotally mounted on respective pins 255 and 256. A cam 259 isslidably fitted (between the chucking pieces 253 and 254 and has frontand rear inclined sliding surfaces in sliding engagement with the topinside surfaces of the chucking pieces. The cam 259 is mounted on a pin257 serving as a guide for the chucking pieces with a coiled spring 258interposed between the outside surface of the chuck piece 253 and theunderside of the head portion of the pin 257. The inner surfaces of thechucking pieces are recessed centrally thereof to define therebetween atruncated conical bore aligned with the axis of the stop rod 250. Asillustrated, the cam 259 is provided with a bellcrank lever includingarms 260 and 264 extending at right angles to each other and formed atthe extremity with respective bearin g apertures having axes parallel tothe axis of pin 257. Link rods 9 and 10 have cylindrical ends journaledin the respective bearing apertures. The cams 259 for the chuckingpieces on the stop brackets arranged on the respective rails adjacent tothe winch are interconnected by the two li-nk rods 9 and 10. A verticaltreadle rod 263 is pivoted by a pin 262 to one of t he link nods 9sulbstantially at the middle thereof. The link rod 10 is connectednearly at the middle of its length wit-h the forked end of an elongatedlink rod 12 by a pin 11. A similar link rod 13 is provided for the chuckcams mounted on the stop brackets located on the

1. A BAND-SAWING MILL HAVING A BAND SAW AND A LUMBER FEEDING MEANS WHICHMEANS COMPRISES A HORIZONTALLY DISPOSED GENERALLY CIRCULAR ROTARY CHUCKWHEEL HAVING A PLURALITY OF CHUCK MEANS PROVIDED CIRCULARLY ON THE WHEELFOR HOLDING LUMBER ON THE PERIPHERY OF THE CHUCK WHEEL